Millstone-dressing machine



(No Model.) I 2 Sheets-Sheet 1.

' J. J. CHAPMAN.

MILLSTONE DRESSING MACHINE.

No. 420,185. Patented Jan. 28, 1890.

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2 Sheets-Sheet 2.*-

(No Mbae.)

J. JV. CHAPMAN. MILLSTONE DRESSING' MACHINE. l

No. 420,185. Patented Jan. 28, 1890.

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UNITED STATES ATENT FFICE JOHN JAMES CHAPMAN, OF NEBLETTS, VIRGINIA.

MILLSTONE-DRESSING MACHINE.

SPECIFICATION forming part of Letters Patent No. 420,185, dated January28, 1890. Application iiled November 12; 1889. Serial No. 330,007. V(Nomodel.)

T0 all whom t may con/cern.-

Be it known that I, JOHN JAMES CHAPMAN, a citizen of the United States,residing at Nebletts, in the county of Lunenburg and State of Virginia,have invented certain new and useful Improvements in Millstone-DressingMachines; and I do declare the following to be a full, clear, and exactdescription of the invention,such as will enable others skilled in theart to which it appertains to make and use the same, reference being hadto the accompanying drawings, and to the letters of reference markedthereon, which forni a part ot` this specication.

This invention relates to stone-dressing machines which have a frameprovided with a gang of picks or dressing-tools, said frame beingreciprocated vertically by suitable operating devices mounted on theframe of the machine.

The object of the invention is to prevent any lateral or swaying motionof the frame carrying the dressing-tools, which is effected in a simpleand economical way by connecting the said frame with the cranks of theoperating-shafts by telescopic hangers.

A further object of the invention is to have the frame carrying thedressing-tools made reversible, whereby when the tools on one side aredull the Jframe can be reversed to bring the sharp set of tools inposition to operate upon the stone.

A still further object oi' the invention consists in having the framecarrying the tools made in sections, each section or bar having a gangof tools secured thereto in a novel manner.

The improvement consists in the peculiarities of construction and in thenovel combination of parts which will be more fully described andclaimed, and shown in the accompanying drawings, in which- Figure l is aside view of a stone-dressing machine embodying my invention. Fig. 2 isa top plan view of the machine. Fig. 3 is a top plan view of the frameprovided with the dressing-tools. Fig. et is a cross-section of thehangers, and Fig. 5 is a detail section showing the manner of securingthe tools to the frame.

The frame is composed of the corner-posts A, the cross-bars B, the lowerside bars C, the upper beams D, the standards E, and the braces F,interposed-between the standardsE and the beams D. The shafts G, neareach end of the frame, are journaled in the beams D, and have their endsprojected beyond the beams D and provided with the cranks g. The middleportion of the shafts is provided with the, stops or collars g', whichbear against the inner sides of the beams D and prevent any longitudinalmovement of the said shaft-s. The sprocket-cliains H and I pass over thepulleys I-I and I upon the shaft G. The shaft J, journaled in thestandards E, has one end extended and provided with the crank j, and hasthe pulley j keyed thereon and l0- cated between the said standards E.The endless band or belt II passes around the pulley j and around one ofthe shafts G, and the endless beltlpasses around the two shafts G,substantially as shown, to transmit motionfrom one to the other. Theframe L,

' carrying the dressing-tools, is suspended from the cranks g by thehangers K, which are composed of the telescopic sections k and 7e Thesections lo are pivoted at their upper ends to the cranks g and havetheir lower ends slotted and provided with the yoke .Ich The sections 7eare pivotally connected with the frame L at their lower ends and havetheir upper ends passing through the yokes k2 and provided with theheads k3, which work in the slots of the sections k. This frame L isreversible, and the dressing-tools Z proJect above andbelow it to bringthe one or the other end of the tools into an operative or activeposition, whereby a sharp or a difterent kind of a cutting-edge may beobtained, as required.

The frame L is composed of a series oi bars placed side by side andsecured together in any desired manner. The bars have verti` cal notchesin their sides, in which the dressing-tools Z are fitted and secured bythe strips N, which are fastened to the sides of the bars by the boltsor pins u, which pins pass through the said tools to hold them againstvertical displacement.

In the present instancel have shown guides consisting of vertical rodsS, which rods are secured at their upper ends to the upper side IOOtimbers of the frame of the machine, said rods being extended throughopenings S', formed for their reception in the outer edges of themovable frame.

In practice the machine is adjusted over the stone, or, what is theequivalent, the stone to be dressed is placed beneath the machine insuch a position that the dressing-tools Will operate on the desired facethereof. The shaft J being set in motion Will transmit its movement tothe shafts G through the devices hereinbefore described, and the frame Lwill receive a vertical reciprocating movement by reason of itsconnection with the cranks g at the ends of the shafts G. Thetelescoping hangers permit the frame Lto adapt itself to the varyingthickness of the stone operated upon. The telescoping sections can haveno possible sag and prevent any lateral motion of the frame L.

Having thus described my invention, what I claim to be new ,is-

1. The combination, with the bars of the frame L, having notches intheir sides, and the tools fitted in said notches, of the strips placedagainst the sides of the bars, and the pins passing through the strips,the tools, and the bars, as and for the purpose described.

2. The combination, with the main frame, the shafts journaled thereinand provided with sprocket-wheels and cranks, as described, and theframe L, provided with the dressingtools, of the telescoping hangersconnecting the shafts, substantially as described, and for the purposespecified. Y

3. The combination, with the main frame, the shafts journaled thereinand provided with sprocket- Wheels and cranks, and the frame L, carryingthe dressing-tools, of the telescoping hangers composed of two sections,which have their outer ends pivotally connected with the cranks and thesaid frame L, substantially as described, and which have the inner endof one section slotted and united by a'yoke, and the inner end of theother section passing through the said yoke and provided With a head,and mechanism, substantially as described, for rotating the shafts uponthe main frame, substantially as described.

4. The combination, with the frame, of the shafts G, having cranks g,and having the stops g, the shaft J, having a pulley j', on one of theshafts G, the belt I, connecting the two shafts G, the frame L, providedwith the dressing-tools, and the telescoping hangers connecting theframe L With the said cranks g, substantially as described. l

In testimony whereof I affix my signature in presence of two Witnesses.r

J OHN JAMES CHAPMAN. lVitnesses:

GEORGE W. ROTH, JOHN W. TURNER.

